feat(dm-dashboard): Wave 1 — auth fixes, DB schema, Open5e interfaces, AI clients

- Fix auth anti-patterns (JWT, OAuth, logout, middleware, url.origin)
- Extend DB schema with tier, npcs, counters, translations, notes, initiative
- Expand Open5e TypeScript interfaces (Monster, Spell) to full V2
- Build OpenRouter API client for FREE tier
- Build Kimi API client for PRO tier
- Add comprehensive tests for all modules

tests/mocks/astro-middleware.ts

@@ -0,0 +1,3 @@
+export function defineMiddleware(fn: unknown) {
+  return fn;
+}